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WM9711 Datasheet(PDF) 32 Page - Wolfson Microelectronics plc

Part # WM9711
Description  LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9711 Datasheet(HTML) 32 Page - Wolfson Microelectronics plc

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WM9711L
Production Data
w
PD Rev 4.1 April 2004
32
JACK INSERTION AND AUTO-SWITCHING
In a phone application, a BTL ear speaker may be connected across OUT3 and HPOUTL, and a
stereo headphone on HPOUTL and HPOUTR. Typically, only one of these two output devices is
used at any given time: when no headphone is plugged in, the BTL ear speaker is active, otherwise
the headphone is used.
The presence of a headphone can be detected using GPIO1 (pin 44) and an external pull-up resistor
(see “Applications Information” section for a circuit diagram). When the jack is inserted GPIO1 is
pulled low by a switch on the socket. When the jack is removed GPIO1 is pulled high by a resistor. If
the JIEN bit is set, the WM9711L automatically switches between headphone and ear speaker, as
shown below.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
12
JIEN
0
Jack Insert Enable – Takes output of GPIO1
logic
58h
Additional
Functional
Control
11
FRC
0
Force Ear Speaker Mode
See table below
Table 20 Jack Insertion / Auto-Switching (1)
JIEN
FRC GPIO1
MODE DESCRIPTION
0
0
X
Jack insert detection disabled
(headphone and ear speaker
can be used at the same
time)
Set by
reg.
24h
and
26h
1
0
0
Jack insert detection
enabled, headphone plugged
in
1
X
1
Jack insert detection
enabled, headphone not
plugged in
0
1
X
Force Ear Speaker Mode
Set by
reg.
24h
and
26h
Set by
reg.
16h
1
1
X
Invalid; do not use this setting
Table 21 Jack Insertion / Auto-Switching (2)


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